Historic. Originally released as an LP in 1966 by Mass Art, this is Allen Kaprow, father of The Happening explaining how to do it, and what is - and is not - a Happening. The philosophy and all the practicalities are covered. And many concrete examples are described. A lot people think they know what Happenings were (or are) and this is a valuable corrective. This is the voice of the time, and the thinking of the time, in aspic - and it is eloquent of its difference from the present. This is a fact - and it comes straight from the horse's mouth. How complex these scenarios were, Art history.